<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="layuimini-2/lib/jquery-3.4.1/jquery-3.4.1.min.js"></script>
    <script>
        $(function (){
            alert("aabb");
        })
    </script>
</head>
<body>
Hello world!世界你好
</body>
</html>